Article
Construction & Building Technology
Fang Sun, Xueyu Pang, Shiho Kawashima, Guodong Cheng, Shenglai Guo, Yuhuan Bu
Summary: This study investigated the effect of tartaric acid on the early-age hydration of oil well cement at high temperatures using isothermal calorimetry, thermogravimetric analysis, and quantitative XRD analysis. The results showed that a high dosage of tartaric acid can change the shape of the cement hydration curve and cause premature setting. Additionally, the dosage of tartaric acid also influenced the ultimate hydration extent of the cement.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
O. Linderoth, L. Wadso, D. Jansen
Summary: This study showed that the thermal power of hydration can be measured for up to a year using isothermal calorimetry, and the degree of hydration can be determined with good agreement using various methods.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Construction & Building Technology
Paulo R. de Matos, Jose S. Andrade Neto, Daniel Jansen, Angeles G. De la Torre, Ana Paula Kirchheim, Carlos E. M. Campos
Summary: This paper discusses the use of in-situ laboratory XRD to assess cement hydration. It provides a literature review, discusses experimental strategies, recommends data analysis routine, and discusses the advantages and limitations of this technique.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Xueyu Pang, Jiankun Qin, Lijun Sun, Ge Zhang, Honglu Wang
Summary: The study revealed that under high temperature and pressure curing conditions, the strength retrogression and microstructure coarsening of cement are related to the consumption of silica, leading to dramatic deterioration in physical and mechanical properties after long-term curing.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Paulo R. de Matos, Jose S. Andrade Neto, Luis U. Tambara Jr, Erich D. Rodriguez, Ana P. Kirchheim, Carlos E. M. Campos
Summary: This article reports the first attempt to use in-situ X-ray diffraction (XRD) to measure the early-age volumetric variation of a cementitious paste, indicating the potential of this technique but further research is needed.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Construction & Building Technology
Kaiqiang Liu, Junjie Yu, Yang Xia, Haiping Wang, Dekun Wang, Jiang Du, Yongding Tian, Xingguo Zhang
Summary: This study investigated the hydration kinetics and microstructure of oil-well cement slurry in the early hydration stage. It revealed the hydrostatic pressure reduction mechanism and the quantitative relationship between the hydration kinetics and hydrostatic pressure. The results showed that the hydrostatic pressure of the cement slurry changed according to the Arrhenius equation. The microstructure of the slurry developed from suspension particles to a particles framework bonded to external interfaces. The hydration products strengthened the framework and decreased the porosity, pore size, and connectivity of the slurry, leading to the loss of hydrostatic pressure. Hydration kinetics indicated that the hydrostatic pressure changed linearly with hydration heat increments. A prediction method using hydration heat increments was developed to successfully predict the hydrostatic pressure of oil-well cement slurry.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
A. Koehler, J. Neubauer, F. Goetz-Neunhoeffer
Summary: This study investigates the effect of mayenite (C(12)A(7)) dissolution on the early hydration of calcium aluminate cement (CAC) at different temperatures. It is found that the presence of C(12)A(7) leads to heat flow and reactions during hydration, as it dissolves instantly after water addition.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Hyunuk Kang, Ahyeon Lim, Juhyuk Moon
Summary: This study explores the use of sodium carbonate anhydrous (Na2CO3) to enhance the reactivity of bottom ash (BA) in the ordinary Portland cement (OPC) system. The presence of Na2CO3 improves the pozzolanic reactions between BA and calcium hydroxide, resulting in remarkable improvements in the mechanical properties of the BA-OPC composite. By adding a very small amount of Na2CO3, the compressive strength of the BA-OPC composite can be significantly increased, contributing to its sustainable development.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Daniele Kulisch, Amnon Katz, Semion Zhutovsky
Summary: All types of concrete contain unhydrated cement. This study used various techniques to quantify the unhydrated cement and hydration degree of different cement pastes. The results showed that there is great potential for recovering and reusing the unhydrated cement in the manufacture of new concrete, with levels ranging from 6-36%.
Article
Construction & Building Technology
Samile R. C. Matos, Paulo R. de Matos, Jose S. Andrade Neto, Carlos E. M. Campos, Ana Paula Kirchheim, Jardel P. Gonsalves
Summary: This research evaluated the feasibility of using spent FCC catalyst as raw material for ye'elimite-containing cements (YCC) production. The results showed that the cement with spent FCC catalyst had higher reaction rates and more hydrated phases formed during the early hydration process.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xueyu Pang, Lijun Sun, Min Chen, Ming Xian, Guodong Cheng, Yang Liu, Jiankun Qin
Summary: The experimental program investigated the hydration and strength development of Class G oil well cement under various curing temperatures. Results showed linear relationships between heat of hydration, non-evaporable water content, and degree of hydration, largely independent of curing temperature. Curing temperature influences hydration and strength development rates, which can be modeled using an equivalent age method.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Tobias Dorn, Tamino Hirsch, Dietmar Stephan
Summary: This study examines the impact of accelerators on cement hydration processes, revealing that ettringite formation is the main factor influencing workability during the first 60 minutes of hydration. Ca(NO3)(2) enhances C-S-H formation but rapidly decreases workability, while TEA promotes ettringite formation leading to reduced workability. The initial and final setting times are mainly determined by the formation of C-S-H phases.
MATERIALS AND STRUCTURES
(2021)
Article
Construction & Building Technology
Jiaqi Yun, Chuang Zhao, Xuhui Li, Haoya Liu, Baochang Liu
Summary: In this study, a high-strength oil-well cement was prepared with hybrid nanosilica (NS) and nanohexagonal boron nitride (h-BN) additives to reduce environmental pollution and extend the lifetimes of oil wells. The addition of NS/h-BN was found to enhance the mechanical strength of the cement. The optimal ratio of nanomaterials was determined to be 2.5 wt% NS and 0.5 wt% h-BN, resulting in increased compressive, flexural, and splitting tensile strengths compared to the blank group.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
J. Goergens, R. Belli, C. Schulbert, F. Goetz-Neunhoeffer
Summary: The study investigated the influence of the CA2/CA ratio on the mechanical properties of a calcium aluminate cement (CAC) binder formulation containing calcite. The hydration degrees of CA2 and CA, as well as the content of AH3, were determined using QXRD. The results showed that the mechanical properties deteriorated significantly above a CA2/CA ratio of 70:30, which correlated well with the presence of macro-porosity.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Jingxuan Cai, Mu Wang, Shiming Zhou, Xiaowei Cheng
Summary: This paper studied the influence of graphite on the mechanical properties of cement paste under simulated thermal recovery of heavy oil and explored its mechanism through testing and microstructure analysis. The addition of graphite significantly improved the strength and deformation resistance of the cement paste at high and low temperatures. The incorporation of graphite promoted the formation of hydration products and filled pores, reducing microcracks. The thermal conductivity of graphite balanced the internal thermal stress of the cement paste and inhibited strength decline under high temperature environments.
Article
Construction & Building Technology
Qi Zheng, Chengyao Liang, Jinyang Jiang, Haiyan Mao, Karen C. Bustillo, Chengyu Song, Jeffrey A. Reimer, Paulo J. M. Monteiro, Haimei Zheng, Shaofan Li
Summary: This study used scanning transmission electron microscopy to examine defects in cement particles at the single-atom level. The researchers identified different types of defects and found that they play a crucial role in cement hydration, facilitating dissolution and providing nucleation sites for hydration products.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Anuj Parashar, Shashank Bishnoi
Summary: This study investigated the hydration of siliceous fly ash, slag, and metakaolin with calcium hydroxide, and found that the rate of hydration and phase assemblage is influenced by the alkali and sulphate content, while siliceous fly ash is less affected by alkalis and sulphates.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Peimin Zhan, Juan Wang, Hanbing Zhao, Wengui Li, Surendra P. Shah, Jing Xu
Summary: This study investigates the influence of hydrothermal synthetic conditions on the properties of C-S-H seeds and reveals the correlations between C-S-H seeds properties, hydration kinetics, and paste performances. It is found that low reactant concentrations and calcium-to-silicon ratios facilitate the production of C-S-H seeds with small size and high purity. Using C-S-H seeds with high effective surface area accelerates the hydration process of cement, resulting in refined pore structure and enhanced strength.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Zhaozheng Meng, Qing-feng Liu, Neven Ukrainczyk, Song Mu, Yufei Zhang, Geert De Schutter
Summary: This study developed a numerical framework to investigate the combined attack of sulfate and chloride ions on cementitious materials in marine and saline environments. The study quantified various chemical reactions and solved the electrostatic potential caused by multi-ion coupling. The results showed that neglecting the multi-ions coupling effect could result in an underestimated chemical coupling strength in competitive chloride-sulfate binding.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Ning Li, Cise Unluer
Summary: This study aimed to improve the carbonation efficiency and reduce processing time of recycled concrete aggregates (RCAs). Wet carbonation with seawater was found to be more efficient than dry carbonation, leading to significant reduction in water absorption and increase in density of RCAs. The compressive strength of recycled aggregate concrete (RAC) prepared with 1-hour seawater carbonated RCAs was also improved. The formation of ettringite and calcite under wet carbonation contributed to the increased density and strength, as well as improved bond strength in the interfacial transition zone of RAC. Seawater presents several advantages as a medium for wet carbonation, including its abundant availability, CO2 capture capacity, and accelerated hydration and carbonation.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Yong Tao, Yining Gao, Yanjie Sun, Roland J. -M. Pellenq, Chi Sun Poon
Summary: Decalcification of calcium silicate hydrates (C-S-H) is an important issue for the long-term safety of cement-based infrastructures. Using molecular simulations, this study reveals an important mechanism of accelerated C-S-H decalcification in seawater, which involves ion exchange between surface Ca and electrical double layers, resulting in a decrease in Ca dissolution free energy. This finding enhances the understanding and prediction of cementitious materials' degradation.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Kumaran Coopamootoo, Enrico Masoero
Summary: This study uses kinetic simulations to investigate the relationship between dissolution rate and saturation index in minerals in solution. Two distinct regimes are observed, with stresses at crystallographic defects controlling the transition between them. A parameterization of the interaction potentials is proposed to obtain consistent interfacial energies with water. The findings contribute to the current discussion on controlling reactivity using materials and defects.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Faping Li, Qianshi Chen, Yiyan Lu, Yunlong Zou, Shan Li
Summary: In this study, the impact of functionalized multi-walled carbon nanotubes and a silane coupling agent on the performance and microstructure of alkali-activated fly ash/slag pastes was investigated. The results showed that the addition of these materials can prolong setting time, improve flowability and mechanical strength, and reduce mass loss and drying shrinkage.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Yaozeng Wang, Wencui Yang, Ai Zhang, Penghuan Liu, Yong Ge
Summary: Low-temperature low-field nuclear magnetic resonance was used to analyze icing in water saturated white cement paste specimens during the freeze-thaw process at different temperatures. The experimental results were compared with classical theory, showing agreement at certain temperatures but discrepancies at others. New equations were proposed based on the analysis of specimens saturated with different solutions to relate the volume of frozen water to temperature during freezing and thawing of cementitious materials.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Shengjie Yan, Yingjie Liang
Summary: This paper proposes a fractal derivative model with a non-linear distributed-order (DOFM) to describe the multi-scaling behaviors of particle diffusion in alkali-activated materials. The DOFM is tested using experimental data and is found to effectively describe the multi-scaling diffusion behaviors of particles in the materials.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Cecilia Pesce, Richard J. Ball, Marco Molinari, Shaun Reeksting, Giovanni Luca Pesce
Summary: This study evaluates the effect of ten organic additives on the microstructure of portlandite crystals during CaO hydration. It was found that the presence of carbohydrates and sulfonates can alter the structure of portlandite and the properties of lime can be controlled by adding carbohydrates. This has significant implications for the development of new binders and reducing CO2 emissions.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Daniel Jansen, Alexander German, Dominique Ectors, Frank Winnefeld
Summary: This study used X-ray diffraction and Rietveld refinement technique to investigate a hydrous carbonate-containing brucite and found that the 001 reflection of this phase split into different patterns at different temperatures. The presence of water and/or carbonate influenced the distance between the layers in the brucite structure.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Dylan Singh, Trinh Thao My Nguyen, Evann Bustamantes, Abdul Wahab, Ahmad Hamzah Yousaf, Ian Shortt, Frank W. Foss Jr, Maria Konsta-Gdoutos, Sang Soo Lee, Erika La Plante
Summary: This study analyzes the chemical structure and morphology of magnesium silicate hydrate (MSH) grown under different concentration ratios and temperatures. The results show that increasing the magnesium to silicon ratio reduces silicate polymerization in MSH, and at higher temperatures and longer reaction times, oriented attachment of nanoparticles and enhanced crystallinity are observed. These findings provide insights into the precise chemical synthesis of MSH and its widespread use as a binder in construction.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
J. C. O. Zepper, S. R. van der Laan, K. Schollbach, H. J. H. Brouwers
Summary: This study presents a method to calculate the main phases of BOF slag based on chemical composition and validates the proposed final model through quantitative model assessment and validation approaches.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Yierfan Maierdan, Samuel J. Armistead, Rebecca A. Mikofsky, Qiqi Huang, Lola Ben-Alon, Wil V. Srubar III, Shiho Kawashima
Summary: This research investigated the effects of sodium alginate on the stability and 3D printability of kaolinite suspensions. The findings showed that sodium alginate could enhance the stability of kaolinite and improve the strength of printable mixtures, as well as shift the printability window.
CEMENT AND CONCRETE RESEARCH
(2024)
